Hand shears



Feb. 7, 1928. 1,658,498

N. A. Rosi:

HAND SHEARS Filed June 25. 1925 ,by I l /9 Patented Feb. 7, 19238.

UNITED STATES PATENT oFFIcE.;

NEWTON AUGUSTUS ROSE, or WELILESLE'Y HILLS, MASSACHUSETTS.

Y HAND SHEARS.

Application led June 25, 1925.y y Serial No. '39,599.

This invention relates to `an improved hand shears for cutting sheet material, es-

pecially Sheet metal, and vhas for its objectv to provide a portable, hand operated device for cutting Sheet metal in strips orv coinpara- Set forth in the' following Specification, and

particularly `as pointed out in the claims thereof. y

Referringlto the drawings y Figure 1 is a side' elevationkof the hand shears of'my invention. j n

Fig. 2 is a front elevation of the device as lviewed from the right of Fig. 1. Fig. 3 is an enlarged vdetail vertical section taken on the line 3-3of Fig. 2.l

Fig. Afis an enlarged detail horizontal Vsectiontalren on the line 4 4 ofFigJ2.

Fig.,5 is an enlarged, detail vertical section taken on theline 5-5 of Fig. 1.V

Like numerals refer' to like parts throughout the several views of the drawings.

In the drawings, 6 is a fra-meeinbodying therein a lower front portion 7 an upper front portion 8, and a `Sernicircular rear portion by which the'upper and lower porf tions-8 and 7 respectively are connected to gether. The upper and lowerportions 8 and 7 respectively of the frame'6 are separated by anarrow slot-10 Awhichextends longi- .tudinallyof ysaid frame from the lfront end thereof, and said slot has flanges .11 upon opposite sides thereof and extending for the ventire length thereof.' vThe rear-'portion rof the frame is reinforced by a vertical rib-12, `andthe lower portion 7 of Said f'rameis re.- inforced by* a rib 13. the latter extending from a point yadjacent the bottom ofy the rib 12 forwardly and upwardly andin-tersecting the flange, 11 ata point midway ofthe slot `10. The frame 6 also hasa foot portion 14 formed vintegral therewith at the forward end thereof anda handleportion 15 formed integraltherewith at the top thereof.

A `cutter blade 16 is fastened to the front end ofthe lower portion7 ofthe frame 6 atthe front thereof by a pair of bolts 17 which extend through Slotsl .18. formed in said frame. The blade 16 extends transversely of the frameand the cutting `edge thereof is located adjacent tothe lower Side Y of the slot 10. The cutter blade 16v maybe adjusted to vvary the inclination of the cut-k tingl edge thereof by loosening the bolts 17 and manipulating adjusting screws 19, the latter engaging the lowery edge of said blade.

A cutter blade 2O is mountedto be reciprocated in ways 21 kprovided at the front end of the upper portion 8 of the frame 6, said cutter blade being actuatedbyV a hand lever 22 pivoted at 23 to a bracket. 24 fast to said frame, an end 25jof said lever 22 projecting into a slot 26V provided in the cutter blade 20.l The bracket 24 is adjustably secured to the frame 6 b v screws 27 which pass through a yslot 28 provided in said bracket. A Screw 29 mounted vin the frame 6 engages the upper end y,of the bracket 24. Y

A spring 30 is interposed betweenw the hand lever 22 and a projecting portionof the frame 6, and saidspring acts to force thefree end of the lever 22 downwardlyjand the` Cutter blade 2OA upwardly, the upward movement of Said blade 20 being limitedv by a stop screw 31, with-which the upper rportion of Said blade engages. Another Stop Screw 32 is also provided for the purpose of limiting the upward movement of the,

free end ofthe hand lever 22 thereby limiting the lextent to which the cutter 2O may be moved downwardly. j.

The leverage of the hand lever v22 maybe varied slightly by removing the pivotal screw'23 from the',positionliny which it is .located in Figs. `1 and 3, andinserting Said screw through a hole' 33 provided in the in Said lever v22. K l j In orderto prevent they portions and 8 of the' frame (iwfrom Spreading at thev Slot vr10 during the cutting operation. a member ,35 yis-k provided, Saidfmember beingfslidably v-mounted upon, the flanges y11 'engagingthe `upper surface ofv theupper flange and the that a Stopgshall be provided for this purpose. y f

lbracket' 24fand througha hole-34 provided.'

An arm 3S formed integral with the upper portion 8 of the frame 6 projects laterally from said frame and longitudinally of the cutting edges of the blades 16 and 20,

the lower face of said arm being approximately flush with the upper side of the slot 10, and said arm constitutes a stripper and prevents the sheet metal from moving upwardly or curling when the cutter blade 2O is moved upwardly.

rlhe object of the stop screw 31 is to compensate for any change in the relative position of the cutting edge of the blade 20 relatively to the cutting edge of the blade 16 caused by the grinding and sharpening of said blades, it being evident that the cutting edges of the two blades may always be located in the same relative positions when the blade 2O is in its uppermost position by adjusting said stop screw 31.

The general operation of the shears hereinbefore specifically described is as follows :-Assuming the parts to be in the rela tive positions illustrated in Figs. 1 and 2, a piece of sheet material is inserted between the cutting edges of the blades 16 and 20, said sheet material projecting into a slot 1() to an extent equal to the width of the strip which it is desir-ed to cut from the main piece of sheet material, and the member may be utilized as a stop to limit the extent to which said sheet material may be inserted within said slot if it is so desired.

The user of the device grips the handle 15 and hand lever 22 with one hand and causes the free end of said lever 22 to move toward the handle portion 15 of the frame 6. The hand lever 22 thus being tipped upon its pivot 23 causes the blade 20 to move downwardly and co-act with the blade 16, the sheet material being severed for a length approximately equal to the cutting edges of 'said blades. Upon releasing the pressure from the lever 22 the same will be carried back to its initial position as illustrated in F ig. 1 by the spring 30, thus causing the cutter blade 2O to move upwardly until the upper end thereof abuts against the lower extremity of the stop screw 31.

This operation is then repeated, the shears being advanced relatively to the material, or the material being advanced relatively to the shears as may be -desired until a piece of said material has been severed from the remainder. During these successive cutting operations it will be seen that when the cutter blade 20 is moved upwardly, the portion of the material being severed cannot follow said blade upwardly on account of the stripper arm 38 which bears against that portion of the material which is being severed from the main piece of sheet material.

During the cutting operation any tendency forthe upper andy lower portions 8 and 7 respectively of the frame 6 to spring apart at the slot 10 will be effectively prevented by the member 35, the latter being positioned as vdesired upon the ianges 11.

to impart a reciprocatory motion to said' slidable blade whereby a piece of sheet mate* rial interposed between said blades and projecting into sait. slot may be severed, and means engaging said flanges and preventing said rame from springing during the cutting operation.

2. A hand shears comprising, in combination, a. frame ha ring a handle portion formed thereon and provided with a slot extending longitudinally" thereof from the front end thereof, said frame embodying therein a flange upon each side of said slot, a cutter blade fast to the front of said frame and eX- tending transversely thereof adjacent to the end of said slot, a cutter blade slidably mounted at the frontof said frame, means to impart a reciprocatory motion to said slid able blade whereby a piece of she-et mate rial interposed between said blades and proj ecting into said slot may be severed, a member slidably mounted upon said flanges and preventing said frame from springing at said slot during the cutting operation, and means to clamp said member to said flanges.

3. A hand shears comprising. in combination, a frame embodying therein upper and lower portions connected together at the rear thereof and having a slot therebetween extending longitudinally thereof from the front end thereof, said vframe also embodying therein a iiange upon each side of said slot and a handle portion at the top thereof, a cutter blade fast to the front of said frame and extending transversely thereof adjacent to the end of said slot, a cutter blade slidabljT mounted at the front ofsaid frame` a. bracket adjnstably mounted upon said frame, and manually actuated means upon said bracket to impart a reciprocatory motion to said slidable blade whereby a piece of sheet material interposed between said blades and projecting into said slot may be severed by said cutter blades.

4. A hand shears comprising, in combi- U nation, a frame embodying therein upper and lower portions connected together at the rear thereof and having a slot therebetween extending longitudinally thereof from the front end thereof, said frame Valso embodying therein ka ange upon each side of said slot and a handle portion at the top thereof, a cutter blade fast to the front of said frame 'and extending transversely thereof adjacent to the end of said slot, a cutter blade slidably mounted at the front of said frame, a bracket adjustably mounted upon said frame, a lever pivotedy to said bracket and adapted to engage said last-named cutter blade whereby a reciprocatory mot-ion may be imparted thereto to sever material interposed between said blades, and means slide ably mounted upon said flanges and preventing said 'frame from'springing during the cutting operation.

5. A hand shears comprising, in combination, a frame embodyingtherein upper and lower portions connected together at the rear thereof and having a slot therebetween eX- tending longitudinally thereof from the front end thereof, said frame also embodying therein a flange upon each side of said slot and a handle portion at the top thereof, acutter bladefast to the front of said frame and extending transversely thereof adjacent to the end ofsaid slot, a cutter blade slidably mounted at the front of said frame, a bracket adj ustably mounted upon said frame, a lever pivoted to said bracket and adapted to engage said last-named cutter blade whereby a reciprocatory motion may be imparted thereto to sever' material interposed between said blades, a spring acting against said lever to force the slidable cutter blade away from said first-named cutter blade, a stop screw on said frame against which said slidable cutter bladel is adapted to abut in moving upwardly, and means slidably mounted upon said flanges and'preventing said frame f y from springing during the cutting. operation.

6. A hand shears comprising, incombina.- tion, aframe embodying therein upper and lower' portions connected together at the rear thereof andihavin a slottherebetween extending longitudinal y thereof Vfrom the front end thereof, said frame also embod ing therein a ange upon each side of ysaid slot and a handle portion at the top thereof, a cutter blade fast to the front of said frame and extending transversely thereof adjacent to the end of said slot, means to adjust said cutter blade upon said frame, a cutter blade slidably mounted at the front of said frame, a bracket slidably mounted upon said frame, a hand lever pivoted'to said bracket and engaging said slidable cutter blade whereby a reciprocatory motion may be imparted to the latter to sever material interposed between said blades, a spring acting against said lever to force said slidable cutter blade away from said first-mentioned cutter blade, a stop y'screw on said frame against which said slid# able cutter blade is adapted to abut when V'moved upwardly, a stop also to limit the upward movement of the free end of said hand lever, a member slidably mounted upon said ianges and preventing said frame from springing atsaid slot during the cutting 0peratioinand means to clamp said member to said flanges.

v7. In a hand shears a frame, a cutter blade slidably mounted upon said frame, a bracket adjustabl mounted upon said frame, a pivot member etachably mounted in said bracket, and a lever mounted upon said pivot and engaging said cutter blade to impart a reciprocatory motion thereto, said bracket and lever being provided with sets of co-operating ioles therein, whereby said pvot member may be positioned to vary the leverage'of said lever.

In testimony whereof I have hereuntoset my hand.

Y NEWTON aueus'rus Ross. 

